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/*************************************************************************
 *
 *  $RCSfile: process_impl.cxx,v $
 *
 *  $Revision: 1.2 $
 *
 *  last change: $Author: hr $ $Date: 2003-03-26 16:46:05 $
 *
 *  The Contents of this file are made available subject to the terms of
 *  either of the following licenses
 *
 *         - GNU Lesser General Public License Version 2.1
 *         - Sun Industry Standards Source License Version 1.1
 *
 *  Sun Microsystems Inc., October, 2000
 *
 *  GNU Lesser General Public License Version 2.1
 *  =============================================
 *  Copyright 2000 by Sun Microsystems, Inc.
 *  901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License version 2.1, as published by the Free Software Foundation.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *  MA  02111-1307  USA
 *
 *
 *  Sun Industry Standards Source License Version 1.1
 *  =================================================
 *  The contents of this file are subject to the Sun Industry Standards
 *  Source License Version 1.1 (the "License"); You may not use this file
 *  except in compliance with the License. You may obtain a copy of the
 *  License at http://www.openoffice.org/license.html.
 *
 *  Software provided under this License is provided on an "AS IS" basis,
 *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
 *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
 *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
 *  See the License for the specific provisions governing your rights and
 *  obligations concerning the Software.
 *
 *  The Initial Developer of the Original Code is: Sun Microsystems, Inc.
 *
 *  Copyright: 2000 by Sun Microsystems, Inc.
 *
 *  All Rights Reserved.
 *
 *  Contributor(s): _______________________________________
 *
 *
 ************************************************************************/

 #ifndef _STRINGS_H
 #include <strings.h>
 #endif

 #ifndef _STDLIB_H
 #include <stdlib.h>
 #endif

 #ifndef _OSL_PROCESS_H_
 #include <osl/process.h>
 #endif

 #ifndef _RTL_USTRING_HXX_
 #include <rtl/ustring.hxx>
 #endif

 #ifndef _OSL_THREAD_H_
 #include <osl/thread.h>
 #endif

 #ifndef _OSL_FILE_HXX_
 #include <osl/file.hxx>
 #endif

 #ifndef _OSL_UUNXAPI_HXX_
 #include "uunxapi.hxx"
 #endif

 #ifndef _OSL_FILE_PATH_HELPER_HXX_
 #include "file_path_helper.hxx"
 #endif

 #include <string.h>

 //------------------------------------
 // forward
 //------------------------------------

 extern "C" sal_Char *getCmdLine();
 extern "C" char* osl_impl_getExecutableName(char * buffer, size_t n);

 //------------------------------------
 // private stuff
 //------------------------------------

 namespace /* private */
 {

    const rtl::OUString UNICHAR_SLASH = rtl::OUString::createFromAscii("/");

    //-------------------------------------------------------
     // if the command line arg 0 contains a '/' somewhere it
    // has been probably invoked relatively to the current
    // working dir
    //-------------------------------------------------------

     inline bool is_relative_to_cwd(const rtl::OUString& path)
    {
        return (path.indexOf(UNICHAR_SLASH) > -1);
    }

    //---------------------------------------------------------
    // make a relative path absolute using the current working
    // directory
    // no return value because osl_getExecutableFile either
    // returns osl_Process_E_None or osl_Process_E_Unknown
    //---------------------------------------------------------

    void make_absolute_to_cwd(const rtl::OUString& relative_path, rtl::OUString& absolute_path)
    {
        rtl::OUString cwd_url;

        if (osl_Process_E_None == osl_getProcessWorkingDir(&cwd_url.pData))
        {
            rtl::OUString cwd;
            osl::FileBase::RC rc = osl::FileBase::getSystemPathFromFileURL(cwd_url, cwd);
            OSL_ASSERT(osl::FileBase::E_None == rc);

            osl::systemPathMakeAbsolutePath(cwd, relative_path, absolute_path);
        }
    }

    //---------------------------------------------------------
    // search for the file using the PATH environment variable
    // no return value because osl_getExecutableFile either
    // returns osl_Process_E_None or osl_Process_E_Unknown
    //---------------------------------------------------------

    void find_in_PATH(const rtl::OUString& file_path, rtl::OUString& path_found)
    {
        rtl::OUString   PATH   = rtl::OUString::createFromAscii("PATH");
        rtl::OUString   env_path;

        if (osl_getEnvironment(PATH.pData, &env_path.pData) == osl_Process_E_None)
            osl::searchPath(file_path, env_path, path_found);
    }

 } // namespace /private */


/***************************************
  osl_getExecutableFile
 **************************************/

oslProcessError SAL_CALL osl_getExecutableFile(rtl_uString** ppustrFile)
{
    sal_Char*     p_cmdline = getCmdLine();
    rtl::OUString cmdline(p_cmdline, strlen(p_cmdline), osl_getThreadTextEncoding());

    free(p_cmdline);

    rtl::OUString abs_path;

    if (osl::systemPathIsRelativePath(cmdline))
    {
        if (is_relative_to_cwd(cmdline))
            make_absolute_to_cwd(cmdline, abs_path);
        else
            find_in_PATH(cmdline, abs_path);
    }
    else
    {
        abs_path = cmdline;
    }

    rtl::OUString path_resolved;
    oslProcessError osl_error = osl_Process_E_Unknown;

    if ((abs_path.getLength() > 0) && osl::realpath(abs_path, path_resolved))
    {
        rtl::OUString furl;
        osl::FileBase::RC rc = osl::FileBase::getFileURLFromSystemPath(path_resolved.pData, furl);
        OSL_ASSERT(osl::FileBase::E_None == rc);

        rtl_uString_assign(ppustrFile, furl.pData);
        osl_error = osl_Process_E_None;
    }
    return osl_error;
}

/***************************************
 Necessary for signal.c
 **************************************/

char* osl_impl_getExecutableName(char * buffer, size_t n)
{
    sal_Char*     p_cmdline = getCmdLine();
    rtl::OUString cmdline(p_cmdline, strlen(p_cmdline), osl_getThreadTextEncoding());

    free(p_cmdline);

    rtl::OUString exename_u;
    osl::systemPathGetFileNameOrLastDirectoryPart(cmdline, exename_u);

    rtl::OString exename_a = rtl::OUStringToOString(exename_u, osl_getThreadTextEncoding());
    char*        pChrRet   = NULL;

    if (exename_a.getLength() < n)
    {
        strcpy(buffer, exename_a.getStr());
        pChrRet = buffer;
    }
    return pChrRet;
}